| 摘要 |
PURPOSE:To uniformize the characteristic of a video modulated signal voltage to a beam current of electron beams of numerous electron sources constituting a plate type cathode-ray tube, by successively impressing specific two kinds of correction factors on video signals corresponding to electron beam radiating electron sources, with one kind of factors being impressed by addition and the other kind of factors by multiplication. CONSTITUTION:At intersecting points of each cathode 10 and each vertical scanning electrode 12, electron sources 50a, 50b, 50c, ... are respectively formed and they are successively set to beam radiating states for every fixed period by vertical scanning electrode driving signals 51 which are successively impressed on the vertical scanning electrodes 12. Then, synchronously with the switching of electron beam radiation from the electron sources, electron beams are successively impressed on modulation means by impressing two kinds of correction factors D52a, D52b,... and D56a, D56b,... corresponding to the electron beam radiating electron sources on video signals 54 corresponding to the electron beam radiating electron sources, with one kind of factors being impressed by addition and the other kind of factors by multiplication. Therefore, the electron beam radiated from each electron source can be corrected so that two points on a video signal voltage to beam current characteristic curve can coincide with each other and unevenness in picture caused by the variation of the characteristic can be eliminated.
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